Grindlay 1

RA:

17 : 32.0

Dec:

-33 : 50

Distance from Sun:

33 kly

Distance from Galactic Center:

Apparent Diameter:

Brightness:

Radial Velocity:

Diameter:

Abs. Mag:

This object is listed as globular cluster in the Sky Catalogue 2000.0, at a distance of about 10 kpc or 33,000 light years.

Jonathan E. Grindlay and Paul Hertz discovered this cluster candidate when looking for a counterpart for the X-ray source GX 354+0, a low-mass X-ray binary discovered with the HEAO-2 (Einstein) X-ray satellite, with the NASA 3-meter IRTF infrared telescope at Mauna Kea Observatory, Hawaii (Grindlay and Hertz, 1981). It was included as globular cluster in the Sky Catalogue 2000.0 and the list of Webbink (1985).

However, it is now considered improbable that this cluster exists, see e.g. the negative results by Djorgovski and Meylan (1993) (who cites a negative finding by Paradijs and Isaacman (1989) and an independent non-confirmation by Grindlay himself) and Ortolani et.al. (1996).

References

• S. Djorgovski and G. Meylan, 1993. The Galactic Globular Cluster Systems - a List of the Known Clusters and Their Positions. In: Structure and Dynamics of Globular Clusters. Proceedings of a Workshop held in Berkeley, California, July 15-17, 1992, to Honor the 65th Birthday of Ivan King. Editors, S.G. Djorgovski and G. Meylan; Publisher, Astronomical Society of the Pacific, Vol. 50, San Francisco, California, p. 325-336 [ADS: 1993sdgc.proc..325D]
• J.E. Grindlay and P. Hertz, 1981. Discovery of an obscured globular cluster associated with GX 354+0 (=4U/MXB 1728-34). Astrophysical Journal, Part 2 - Letters to the Editor, vol. 247, pp. L17-L21 (July 1, 1981) [ADS: 1981ApJ...247L..17G]
• Alan Hirshfeld and Roger W. Sinnott (Eds.), 1985. Sky Catalogue 2000.0. Volume 2. Double Stars, Variable Stars and Nonstellar Objects. Cambridge University Press and Sky Publishing Corporation, Cambridge, Massachusetts.
• S. Ortolani, E. Bica and B. Barbuy, 1996. NTT V, I and Gunn Z colour-magnitude diagrams of Liller 1: a globular cluster as metal-rich as the inner bulge stellar population? Astronomy and Astrophysics, Vol. 306, p. 134-140 (Feb 1996) [ADS: 1996A&A...306..134O]
• R.F. Webbink, 1985. Structure parameters of galactic globular clusters. In: Dynamics of star clusters; Proceedings of the Symposium, Princeton, NJ, May 29-June 1, 1984. Dordrecht, D. Reidel Publishing Co., p. 541-577 [ADS: 1985IAUS..113..541W]